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I will preface this post with an apology for not putting it in the math/science learning materials section. This would have been the best place to post my question, but for some reason I can't post there.

My question is the following: what depth of understanding must I have of tensors in order to start going through the math behind general relativity? Also, if anyone knows of any particularly good books for learning about tensors, feel free to share them. (I bought this book: https://www.amazon.com/Tensors-Differential-Variational-Principles-Mathematics/dp/0486658406, but I'm having a terribly difficult time following it; I strongly agree with the reviewer who wrote that he got lost in the gallimaufry of summations).

Edit: sorry for typos

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# Tensors and General Relativity

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